In light of emerging evidence on the Omicron variant, from 4am on Tuesday 7 December anyone aged 12 and above wishing to travel to the UK will need to show a negative pre-departure test (LFD or PCR) as close as possible to departure and not more than 48 hours before to slow the importation of the new variant.
These are temporary measures that have been introduced to prevent further Omicron cases from entering the UK, and will be examined at the three-week review point on 20 December.
Further information: https://www.gov.uk/government/news/tests-required-before-travel-to-uk-and-nigeria-added-to-red-list